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Title: PLA2G7 Genotype, lipoprotein-associated phospholipase A2 activity, and coronary heart disease risk in 10 494 cases and 15 624 controls of european ancestry
Authors: Casas, Juan Pablo 
Ninio, Ewa 
Panayiotou, Andrie 
Palmen, Jutta A. 
Cooper, Jackie A. 
Ricketts, Sally L. 
Sofat, Reecha 
Nicolaides, Andrew N. 
Corsetti, James P. 
Fowkes, Francis Gerald R 
Tzoulaki, Ioanna 
Kumari, Meena 
Brunner, Eric John 
Kivimaki, Mika 
Marmot, Michael Gideon Ideon 
Hoffmann, Michael Marcus 
Winkler, Karl 
Marz, Winfred 
Ye, Shu 
Stirnadel, Heide A. 
Khaw, Kay Tee T 
Humphries, Steve Eric 
Sandhu, Manjinder S. 
Hingorani, Aroon D. 
Talmud, Philippa J. 
Keywords: Epidemiology
Mendelian randomization analysis
Risk factors
Issue Date: Jun-2010
Publisher: American Heart Association, Inc.
Source: Circulation, 2010, Volume 121, Issue 21, Pages 2284-2293
Abstract: BACKGROUND-: Higher lipoprotein-associated phospholipase A2(Lp-PLA2) activity is associated with increased risk of coronary heart disease (CHD), making Lp-PLA2 a potential therapeutic target. PLA2G7 variants associated with Lp-PLA2 activity could evaluate whether this relationship is causal. METHODS AND RESULTS-: A meta-analysis including a total of 12 studies (5 prospective, 4 case-control, 1 case-only, and 2 cross-sectional studies; n=26 118) was undertaken to examine the association of the following: (1) Lp-PLA2 activity versus cardiovascular biomarkers and risk factors and CHD events (2 prospective studies; n=4884); (2) PLA2G7 single-nucleotide polymorphisms and Lp-PLA2 activity (3 prospective, 2 case-control, 2 cross-sectional studies; up to n=6094); and (3) PLA2G7 single-nucleotide polymorphisms and angiographic coronary artery disease (2 case-control, 1 case-only study; n=4971 cases) and CHD events (5 prospective, 2 case-control studies; n=5523). Lp-PLA2 activity correlated with several CHD risk markers. Hazard ratios for CHD events for the top versus bottom quartile of Lp-PLA2 activity were 1.61 (95% confidence interval, 1.31 to 1.99) and 1.17 (95% confidence interval, 0.91 to 1.51) after adjustment for baseline traits. Of 7 single-nucleotide polymorphisms, rs1051931 (A379V) showed the strongest association with Lp-PLA2 activity, with VV subjects having 7.2% higher activity than AAs. Genotype was not associated with risk markers, angiographic coronary disease (odds ratio, 1.03; 95% confidence interval, 0.80 to 1.32), or CHD events (odds ratio, 0.98; 95% confidence interval, 0.82 to 1.17). CONCLUSIONS-: Unlike Lp-PLA2 activity, PLA2G7 variants associated with modest effects on Lp-PLA2 activity were not associated with cardiovascular risk markers, coronary atheroma, or CHD. Larger association studies, identification of single-nucleotide polymorphisms with larger effects, or randomized trials of specific Lp-PLA2 inhibitors are needed to confirm or refute a contributory role for Lp-PLA2 in CHD.
ISSN: 1524-4539
DOI: 10.1161/CIRCULATIONAHA.109.923383
Rights: © American Heart Association
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